Rock-drill



y(No Mrodel.)

W. 0.- HIGGINS.

' ROCK DRILL.

No.l508,313. Patented Nov. '7, 1893.

L W/TNESSES /A/'VENTOH M5 MVL@ ATTORNEYS.

ihynutnl STATES PATENT OFFICE.

VILLIAM O. HIGGINS, OF KINGWOOD, INDIANA.

ROCK-cmu..

SPECIFICATION forming part of Letters Patent No. 508,313, dated November 7,1893.

Application filed July 13, 1893. Serial No. 480,370. (No model.)

To all whom it may concern:

Be it known that I, WILLIAM O. HIGGINS, of

Kingwood, in the county of Ripley and State of Indiana, have invented a new and Improved 5 Rock-Drill, of which the following is a full,

lclear, and exact description.

My invention'relates to 'improvements in rock` drills; and the object of my invention is to produce a Very simple, durable, efficient and easily operated drill, which may be contain features ofconstruction and combina-A veniently worked by hand, and which may be handled easily by a single man so as to place it in the desired position.

To these ends my invention consists in cer- ,tions of parts, 'as'will be hereinafter described and claimed. y

Reference is to be had to the accompanying drawings forminga partof this specification,

zo in which similar figures of reference indicate corresponding parts in all the views.

Figure 1 is a front elevation, partly in section, of the drill embodying my invention.

Fig. 2 is a broken side elevation of the same. V

Fig. 3 is apla'n View of the machine; and Fig. 4 is a detail side elevation of the eccentric rod and its connections, hereinafter more particularly described.

The machine is provided with a suitable upright frame 10 which is made vstrong but driving gear and shaft to be lowered with the drill, as the latter is forced into the rock. The driving shelf 12 has at its outer end a pinion 14 which mesheswith a gear wheel 15, this being also journaled in the sash 13, and the gear wheel is provided with a crank 16 by which it may beturned. The pinion is smaller than the gear wheel, so that the necessary speed may be given to the drivingshaft. The driving shaft 12 is provided at its rear end 5o with a balance Wheel 17 to a` crank 17a on which is pivoted a pitman 18, and the lower end of the pitnIan is pivotally connected with the verticallyl movable drill shaft 19 which slides up and down in the frame. The pitman 18 is slotted at its lower end, as shown at 20, to receive a slide block 21 which is pressed normally by a spring 22 to the outer end of the slot, as shown in Fig. 2, and in it is journaled a stud 23 on the sleeve 24 which embraces the shaft 19 and is'held between collars 25. This arrangement causes the shaft 19 to be worked up or down by the revolution of the balance wheel 17, and the slide block and slotted pitrnan give the necessary freedom of movement to effect the steady reciprocation of the shaft.

The drill 26 may be of any usual kind and it is secured to the lower end of the drill shaft 19 in any ordinary way. The upper portion of the drill shaft 19 is provided with a longitudal key-way 27 which receives a key on the double ratchet wheel 28, this wheel being mounted on the shaft on the top of the frame 10, and the drill may therefore slide'longitudinally through,v the ratchet Wheel but will turn with the latter. The ratchet wheel is intended to turn the drill shaft after each stroke of the drill, in the manner similar to the way the drill is turned by hand, so as to bring it to bear effectively on the rock. The ratchet wheel is provided with a double series ofteeth 29 ari-:d 30'to engage the pawl 31 which is actuated from the driving shaft and which turns the ratchet Wheel; and the pawl is loosely mounted so that it may be thrown into engagement with either the outer or inner set of teeth and thus turn the drill slower or faster according to the speed of the feed. The pawl'31 is pivoted on one end of a lever 32, which is centrally fulcrumed'on a support 33, see Fig. 1, and the opposite end of the lever connects by a link 34 with the upper end of a hollow shaft 35 which is fulcrumed at the rear upper end of the machine as shown in 36 in Fig. 2. In the hollow shaft fits and works the eccentric rod 35a' which is threaded at its lower end and enters a suitable threaded aperture in the box 37 of the eccentric 38 on the driving shaft 12, this connection permitting the rod 35a to be adj usted in the hollow shaft and in relation to the eccentric as may be desired. It will be seen that at each IOO revolution of the driving shaft, the eccentric will be tilted, and will move the link 34 and lever 32 and cause the pawl 3l to turn the ratchet wheel 28, the drill shaft 19 and the drill 26.

A similar means is used for feeding the drill downward; that is to say the feed shaft is connected with the eccentric rod in substantially the same way that the drill shaft is connected. The feed shaft '39 is mounted vertically in the frame 10, and its lower end is screw threaded and fits in a nut 41 on the sash 13, so that when the feed shaft is turned the sash is carried up ordown, according to the direction of the shaft. The shaft 39 has a crank 4:2 at the top, so that it may be turned by hand when desired, but it is usually turned automatically, as described below. The shaft 39 is provided with a double toothed ratchet wheel 43, which connects with the eccentric rod 35 by means of a pawl 31, lever 32*L which is fulcrumed on a SDP- port 33, and link 34, the connection being exactly like that between the eccentric rod and the ratchet Wheel 28.

To operate the machine the crank 1 6 is grasped and the cog wheel 15 is turned, which communicates its motion to the driving shaft 12 and balance wheel 17 and the latter, by means of the crank 17 a and pitnian 18, works the drill shaft 19 up and down and causes the drill to strike repeated blows upOIl the rock beneath.

At every revolution of the driving shaft and before the drill strikes the rock, the eccentric 38 tilts the rod 35 which, by means of the pawls and links above described, turns the ratchet wheels 28 and 43. The turning of the former turns the drill to bring it into effective position on the rock, and the movement of the latter turns the feed shaft 39 which, acting on the nut 41, moves down the sash 1 3 and the drill driving mechanism, and as the drill is supported by means of its connection with the balance wheel 17, it will be seen that the drill will be fed downward steadily so as to be able at every stroke to deliver an effective blow upon the rock, while the driving mechanism will move at a similar rate and will always be in position for efficient work.

Having thus described my invention, I claim as new and desire to secure by Letters Patent- 1. In a rock drill, the combination with a frame, a vertically movable drill holding shaft and a driving shaft,of an eccentric on the -driving shaft, a pivoted lever operated by the eccentric, a ratchet wheel slidably mounted on the drill shaft, a centrally pivoted lever, a pawl pivoted to said centrally pivoted lever, a link connecting the said levers, and means for reciprocating the drill shaft from the driving shaft, substantially as described.

2. In a rock drill the combination with a frame, avertically movable drill holding shaft, a sliding sash in the frame, and a driving' Shaft mountedin the sash, of a screw shaft for adj usting the sash, ratchet wheels mounted 0n the drill shaft and feed screw an eccentric on the driving shaft, a pivoted lever, centrally pivoted levers, links connecting lthe said levers, pawls pivoted to one end of the said centrally pivoted levers, and means for reciprocating the drill shaft from the driving shaft, substantially as described,

8. In a rock drill, the combination with a frame, a vertically movable d rill holding shaft, a sliding sash Ain the frame, a driving shaft mounted in the sash, and means for reciprocating the drill shaft from the driving shaft, of a screw shaft for adjusting the sash, ratchet wheels mounted on the drill shaft and feed screw, a hollow pivoted lever, an eccentric on the driving shaft, an eccentric rod projecting into the hollow shaft, centrally pivoted 1evers, links connecting the said levers with the hollow lever, and pawls pivoted to the ends of the centrally pivoted levers, substantially as described.

WILLIAM O. HIGGINS.

Witnesses:

Lnvr B. HUGHES, ELMEB, M. HUGHES. 

